Some friends landed their helo and taxied to the hangar apron, where they shut down, got out, wearing bright orange flight suits, and walked into the hangar complex. On arrival in the ops room the telephone rang.
Twr: Could I speak to the Capt of Landed Helo please?
Capt: Yes, speaking.
Twr: You know you should be wearing your Hi-Viz jackets when walking from the aircraft and on the apron?
Capt: Yes, apologies, I understand, but how did you know we were not wearing them?
Twr: Oh, we saw you from the Tower!
Surely the purpose of the Hi-Viz jacket is to be seen? If the Tower could see them over 500m away without jackets, then they are surely visible – no?